-5500 Date of astrological observations associated with ancient events later mentioned in the Puranas (Alain Danielou).

-3928 July 25th: the earliest eclipse mentioned in the Rig Veda (according to Indian researcher Dr. Sri P.C. Sengupta).

-3200 In India, a special guild of Hindu astronomers (nakshatra darshas) record in Vedic texts citations of full and new moon at winter and summer solstices and spring and fall equinoxes with reference to 27 fixed stars (nakshatras) spaced nearly equally on the moon’s ecliptic (visual path across the sky). The precession of the equinoxes (caused by the mutation of the Earth’s axis of rotation) makes the nakshatras appear to drift at a constant rate along a predictable course over a 25,000-year cycle. Such observations enable specialists to calculate backwards to determine the date the indicated position of moon, sun and nakshatra occurred.

-3139 Reference to vernal equinox in Rohini (middle of Taurus) from some Brahmanas, as noted by B.G. Tilak, Indian scholar and patriot. Now preferred date of Mahabharata war and life of Lord Krishna

-2500 Reference to vernal equinox in Krittika (Pleiades or early Taurus) from Yajur and Atharva Veda hymns and Brahmanas. This corresponds to Harappan seals that show seven women (the Krittikas) tending a fire.

-2350 Sage Gargya (born 2285), 50th in Puranic list of kings and sages, son of Garga, initiates method of reckoning successive centuries in relation to a nakshatra list he records in the Atharva Veda with Krittika as the first star. Equinox occurs at Krittikia Purnima.

-1424 Mahabharata War occurs (dated from reference in the Mahabharata citing winter solstice at Dhanishtha, which occurs around this time). (conflicts with the 3139 BC)

-1255 King Suchi of Magadha sets forth Jyotisha Vedanga, dating it by including an astronomical note that summer solstice is in Ashlesha Nakshatra.

-850 The Chinese are using the 28-nakshatra zodiac called Shiu, adapted from the Hindu jyotisha system.”